CN112821080A - Thin-layer filtering structure for transmitting waves in L frequency band - Google Patents
Thin-layer filtering structure for transmitting waves in L frequency band Download PDFInfo
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- CN112821080A CN112821080A CN202110002036.3A CN202110002036A CN112821080A CN 112821080 A CN112821080 A CN 112821080A CN 202110002036 A CN202110002036 A CN 202110002036A CN 112821080 A CN112821080 A CN 112821080A
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- layer
- thin
- frequency
- selective surface
- surface layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
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Abstract
The invention relates to a thin-layer filter structure for transmitting waves in an L frequency band, which comprises: skin layer (1), foam layer (2), first frequency selective surface layer (3) and second frequency selective surface layer (4), from last down be skin layer (1) in proper order, first frequency selective surface layer (3), skin layer (1), foam layer (2), skin layer (1), second frequency selective surface layer (4), skin layer (1), foam layer (2), skin layer (1), first frequency selective surface layer (3) constitute first metal unit (5) of cross arrangement in the two-dimensional plane of first frequency selective surface layer (3), second metal unit (6) of cross arrangement in the two-dimensional plane of second frequency selective surface layer (4) constitute.
Description
Technical Field
The invention relates to the technical field of filter structures, in particular to a thin-layer filter structure for transmitting waves in an L frequency band and reflecting waves in other frequency bands.
Background
On various types of equipment provided with radar sensors, the low detectability of a radar system is improved by the antenna housing formed by a special microwave filtering structure. The microwave filtering structure is mainly a composite structure designed by adopting a frequency selective surface technology.
The traditional microwave filtering structure adopting the frequency selective surface technology mostly focuses on the wave-transparent frequency above the S frequency band, and the filtering structure for the wave-transparent of the L frequency band is mainly realized by adopting a band-stop frequency selective structure of a patch unit or a band-pass frequency selective structure of a gap unit. The band-stop frequency selection structure of the patch unit does not have the capability of stopping electromagnetic waves lower than an L-waveband, and the band-pass frequency selection structure of the slit unit can generate grating lobes at high frequency when the band-pass frequency selection structure is incident at a large angle, so that the capability of inhibiting the high-frequency electromagnetic waves is reduced. In addition, the thickness of the traditional L-band wave-transmitting filter structure is about 4 (the wavelength of the electromagnetic wave corresponding to the central frequency of the working band), and the thickness size is large, so that the traditional L-band wave-transmitting filter structure is not suitable for the application of the antenna housing.
Therefore, in view of the above disadvantages, it is desirable to provide a thin-layer filter structure that is transparent in the L-band.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem that the thickness of a conventional low-frequency wave-transmitting filter structure is difficult to reduce.
(II) technical scheme
In order to solve the technical problem, the invention provides a thin-layer filter structure which is transparent to waves in an L frequency band, the thin-layer filter structure comprises a skin layer 1 and a foam layer 2, and the thin-layer filter structure further comprises a first frequency selective surface layer 3 and a second frequency selective surface layer 4.
Preferably, the upper and lower layers of the thin-layer filter structure are centrosymmetric with the second frequency selective surface layer 4; preferably, the thin-layer wave-transmitting structure is a multilayer structure, and is composed of a skin layer 1, a first frequency selective surface layer 3, a skin layer 1, a foam layer 2, a skin layer 1, a second frequency selective surface layer 4, a skin layer 1, a foam layer 2, a skin layer 1, a first frequency selective surface layer 3 and a skin layer 1 from top to bottom in sequence, and all the layers are bonded together.
Preferably, the skin layer 1 is a glass fiber material.
Preferably, the foam layer 2 is a PMI material.
Preferably, the skin layer in the thin-layer filter structure has a thickness of 0.2mm to 0.6mm, the first frequency selective surface layer has a thickness of 0.05mm to 0.12mm, the foam layer has a thickness of 2mm to 5mm, and the second frequency selective surface layer has a thickness of 0.05mm to 0.12 mm.
Preferably, the first frequency selective surface layer 3 is composed of a first array unit (7) repeatedly arranged in a two-dimensional plane with a period D1 in the horizontal direction and a period D2 in the vertical direction, wherein the first array unit (7) is composed of two adjacent first metal units (5) with a center-to-center distance R, wherein the first metal units (5) are hexagonal metal patches having a side length L1; wherein the value range of D1 is 3mm-9mm, the value range of D2 is 1.5mm-5mm, the value range of L1 is 1mm-3mm, and the value range of R is 1.5mm-5 mm.
Preferably, the second frequency selective surface layer 4 is composed of a second array of cells (8) repeatedly arranged in a two-dimensional plane with a period D1 in the horizontal direction and a period D2 in the vertical direction, wherein the second array of cells (8) is composed of two adjacent second metal cells (6), the second metal cells (6) are "m" shaped metal patches, and the patch width is W; wherein the value range of W is 0.1mm-2 mm.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
(1) when the thin-layer filtering structure for transmitting waves in an L frequency band is used, electromagnetic wave signals with various frequencies enter from the outer side of the uppermost skin layer 1 and sequentially pass through the filtering structure formed by combining the skin layer 1 and the first frequency selection surface layer 3, the foam layer 2, the filtering structure formed by combining the skin layer 1 and the second frequency selection surface layer 4, and the filtering structure formed by combining the skin layer 1 and the first frequency selection surface layer 3. The upper and lower layers of the structure are centrosymmetric with respect to the second frequency selective surface layer 4. The filtering structure formed by combining the skin layer 1 and the first frequency selective surface layer 3 has capacitive reactance characteristic to incident electromagnetic waves, the filtering structure formed by combining the skin layer 1 and the second frequency selective surface layer 4 has inductive reactance characteristic to the incident electromagnetic waves, electromagnetic wave signals outside an L frequency range are reflected back through a capacitive reactance-inductive reactance-capacitive reactance combination mode, the electromagnetic waves of the L frequency range are selected to pass through, and finally only the electromagnetic wave signals of the L frequency range are output by the lowest skin layer 1.
(2) The filter structure of the invention adopts the combination of the frequency selective surface with capacitive reactance characteristic and the frequency selective surface with inductive reactance characteristic, thus realizing the functions of transmitting the L-band electromagnetic wave and reflecting the other bands of electromagnetic wave. Meanwhile, the thickness of the filtering structure is greatly reduced, is smaller than 25 (the thickness is smaller than the wavelength of electromagnetic waves corresponding to the central frequency of a working frequency band), and is suitable for forming an antenna housing structure of each equipment platform.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a thin-layer filter structure of the present invention that is wave-transparent in the L-band;
fig. 2 is a first frequency selective surface layer structure diagram of an embodiment of the thin layer filter structure of the present invention that is wave-transparent in the L-band;
FIG. 3 is a second frequency selective surface layer structure diagram of an embodiment of the thin layer filter structure of the present invention that is wave-transparent in the L-band;
FIG. 4 is a schematic wave-transparent curve diagram of one embodiment of a thin-layer filter structure of the present invention that is wave-transparent in the L-band;
the reference numbers in the drawings are as follows: 1. a skin layer, 2, a foam layer, 3, a first frequency selective surface layer, 4, a second frequency selective surface layer, 5, a first metal unit, 6, a second metal unit, 7, a first array unit, 8, a second array unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a thin-layer filter structure for transmitting waves in an L frequency band, which comprises a skin layer 1, a foam layer 2, a first frequency selective surface layer 3 and a second frequency selective surface layer 4, as shown in figure 1.
According to some preferred embodiments, the thin-layer filter structure is centrosymmetric with respect to the second frequency-selective surface layer 4; preferably, the thin-layer wave-transmitting structure is a multilayer structure, and is composed of a skin layer 1, a first frequency selective surface layer 3, a skin layer 1, a foam layer 2, a skin layer 1, a second frequency selective surface layer 4, a skin layer 1, a foam layer 2, a skin layer 1, a first frequency selective surface layer 3 and a skin layer 1 from top to bottom in sequence, and all the layers are bonded together.
According to some preferred embodiments, the skin layer 1 is a fiberglass material.
According to some preferred embodiments, the foam layer 2 is made of a foam board material, and the foam layer 2 is a PMI material.
According to some preferred embodiments, the skin layer in the thin-layer filter structure has a thickness of 0.2mm to 0.6mm, the first frequency selective surface layer has a thickness of 0.05mm to 0.12mm, the foam layer has a thickness of 2mm to 5mm, and the second frequency selective surface layer has a thickness of 0.05mm to 0.12 mm.
As shown in fig. 2, the first frequency selective surface layer 3 is formed by a first array unit 7 repeatedly arranged in a two-dimensional plane with a period D1 in the horizontal direction and a period D2 in the vertical direction, wherein the first array unit 7 is formed by two adjacent first metal units 5 with a center-to-center distance R, wherein the first metal units 5 are hexagonal metal patches having a side length L1;
wherein the value range of D1 is 3mm-9mm, the value range of D2 is 1.5mm-5mm, the value range of L1 is 1mm-3mm, and the value range of R is 1.5mm-5 mm.
As shown in fig. 3, the second frequency-selective surface layer 4 is formed by a second array unit 8 repeatedly arranged in a two-dimensional plane with a period D1 in the horizontal direction and a period D2 in the vertical direction, wherein the second array unit 8 is formed by two adjacent second metal units 6, the second metal units 6 are "m" shaped metal patches, and the width of the patches is W;
wherein the value range of W is 0.1mm-2 mm.
With reference to fig. 1 and 4, when the thin-layer filter structure for transmitting waves in the L-band is in use, electromagnetic wave signals of various frequencies enter from the outer side of the uppermost skin layer 1 and sequentially pass through the filter structure formed by combining the skin layer 1 and the first frequency selective surface layer 3, the foam layer 2, the filter structure formed by combining the skin layer 1 and the second frequency selective surface layer 4, and the filter structure formed by combining the skin layer 1 and the first frequency selective surface layer 3. The upper and lower layers of the structure are centrosymmetric with respect to the second frequency selective surface layer 4. The filtering structure formed by combining the skin layer 1 and the first frequency selective surface layer 3 has capacitive reactance characteristic to incident electromagnetic waves, the filtering structure formed by combining the skin layer 1 and the second frequency selective surface layer 4 has inductive reactance characteristic to the incident electromagnetic waves, electromagnetic wave signals outside an L frequency range are reflected back through a capacitive reactance-inductive reactance-capacitive reactance combination mode, the electromagnetic waves of the L frequency range are selected to pass through, and finally only the electromagnetic wave signals of the L frequency range are output by the lowest skin layer 1.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides a thin layer filtering structure of passing through wave in L frequency channel, thin layer filtering structure includes skin layer (1), foam layer (2), its characterized in that: the thin-layer filter structure further comprises a first frequency-selective surface layer (3) and a second frequency-selective surface layer (4).
2. The thin layer filter structure of claim 1, wherein: the upper layer and the lower layer of the thin-layer filtering structure are centrosymmetric by a second frequency selection surface layer (4); preferably, the thin-layer wave-transmitting structure is a multilayer structure, and is a skin layer (1), a first frequency selective surface layer (3), a skin layer (1), a foam layer (2), a skin layer (1), a second frequency selective surface layer (4), a skin layer (1), a foam layer (2), a skin layer (1), a first frequency selective surface layer (3) and a skin layer (1) from top to bottom in sequence, and the layers are bonded together.
3. The thin layer filter structure of claim 1, wherein: the skin layer (1) is made of glass fiber materials.
4. The thin layer filter structure of claim 1, wherein: the foam layer (2) is a PMI material.
5. The thin layer filter structure of claim 1, wherein: the thickness of a skin layer (1) in the thin-layer filtering structure is 0.2mm to 0.6mm, the thickness of a first frequency selection surface layer (3) is 0.05mm to 0.12mm, the thickness of a foam layer (2) is 2mm to 5mm, and the thickness of a second frequency selection surface layer (4) is 0.05mm to 0.12 mm.
6. The thin layer filter structure of claim 1, wherein: the first frequency selective surface layer (3) is formed by a first array unit (7) which is repeatedly arranged in a two-dimensional plane with the period of D1 in the horizontal direction and the period of D2 in the vertical direction, wherein the first array unit (7) is formed by two adjacent first metal units (5) with the center distance R, the first metal units (5) are hexagonal metal patches, and the side length of each metal patch is L1.
7. The thin layer filter structure of claim 1, wherein: the value range of D1 is 3mm-9mm, the value range of D2 is 1.5mm-5mm, the value range of L1 is 1mm-3mm, and the value range of R is 1.5mm-5 mm.
8. The thin layer filter structure of claim 1, wherein: the second frequency selective surface layer (4) is formed by a second array unit (8) which is repeatedly arranged in a two-dimensional plane with the period of D1 in the horizontal direction and the period of D2 in the vertical direction, wherein the second array unit (8) is formed by two adjacent second metal units (6), the second metal units (6) are metal patches in a shape like a Chinese character 'mi', and the width of the patches is W; wherein the value range of W is 0.1mm-2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110002036.3A CN112821080A (en) | 2021-01-04 | 2021-01-04 | Thin-layer filtering structure for transmitting waves in L frequency band |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110002036.3A CN112821080A (en) | 2021-01-04 | 2021-01-04 | Thin-layer filtering structure for transmitting waves in L frequency band |
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